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Description

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

PUBLISHED Reserved 2026-04-29 | Published 2026-04-29 | Updated 2026-04-29 | Assigner mitre




HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Product status

Default status
unaffected

Any version before 11.0.0
affected

References

github.com/gchq/CyberChef/issues/2344

github.com/...ommit/9641ae07f92e9af50f10e978385465b2f4a36c4d

github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0

github.com/gchq/CyberChef/pull/2346

cve.org (CVE-2026-42615)

nvd.nist.gov (CVE-2026-42615)

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